Sales at gyms not newly opened or closed jumped 7.6%, more than the 5.9% predicted by analysts cited by FactSet. Planet Fitness shares, which have been trading at highs, recently rose 1.6% to $20.65 in after-hours trading.

The Newington, N.H., fitness chain, which touts its low pricing and an environment that welcomes casual gym-goers, said it now expects annual revenue in the range of $366 million to $372 million, up from its previous outlook of $360 million to $370 million.

The company also raised its forecast for adjusted per-share earnings by a penny to between 63 cent and 66 cents. In addition, Planet Fitness now sees same-store sales rising by a percentage in the high-single digits for the year, better than the previous prediction for growth in the mid-single digits.

For the year, analysts surveyed by Thomson Reuters expected per-share earnings of 65 cents on $366 million in revenue.

Over all, for the second quarter, Planet Fitness reported a profit of $18.1 million, or 11 cents a share, compared with $11.6 million a year earlier. Excluding certain items, adjusted earnings were $16.8 million, or 17 cents a share, up from $13.2 million a year earlier.

Revenue rose 15.9% to $91.5 million.

Analysts surveyed by Thomson Reuters had projected adjusted earnings of 15 cents a share on $85 million in revenue.